Insects and Spiders - Mealybug Destroyer
Cryptolaemus montrouzieri
A Mealybug Destroyer's presence implies that there are mealybugs (Amonostherium lichtensioides) around to be destroyed. However, I've never seen either a mealybug or a mealybug sac.
This is what an adult Mealybug Destroyer looks like. All of my photos are of the Mealybug Destroyer's larval case. Photo copyright Holger Casselmann, 2013.